CFA Exam Day is tomorrow, and nerves around Wall Street are probably running high. Stakes are particularly high for those hoping to pass Level 2 and Level 3 because they are offered only once a year—CFA Level 1 hopefuls can also write in December.

So to celebrate the occasion, Clusterstock has been running and collecting CFA Exam Day horror stories throughout the week.

This last story in our series may be one you've heard before. But it's a painfully important reminder for all test takers.

We thought it was best told four years ago by a poster on AnalystForum. It involves a CFA candidate and his friend, who went into his Level 3 exam confident and well prepared. Except he overlooked one small thing.

The tale, as written by the poster IH8FSA, has been edited for brevity and clarity—

This guy used up 1 month of vacation time (all plus some personal days etc) to study. He was the only person I knew leading up to the exam who was extremely confident of the Level 3 exam. "Oh man, I can't wait to ace this thing, I breezed through all the practice exams, and online CFAI exams, as well as the Schwesser exams."

The two went to the exam together, making sure to check that they had everything they need—calculators, pencils, erasers, ID, exam ticket, etc. When the poster went into the exam room, he and his confident friend went separate ways and agreed to meet up during the break.

After an especially difficult morning exam, the guy came out of the exam to find his friend sitting in a corner and looking like he had been crying. Expecting his confident friend had also had a hard time with the exam, he tried to comfort him. From the post—

I said: "Don't worry man, I talked to like 6 people in the room after the exam and they all said they did horrible, don't be so upset man, the afternoon won't be as bad".

He said: "I didn't write it, bro."

I said: "What the fu*k are you talking about??"

He said: "My license expired on May 30th!"

They wouldn't let him write because his license was expired. Can you FREAKIN' believe that?! One week expired, and it wasted about a year of his life and 1 month vacation time.

We're interested in collecting new, fresh stories from the CFA exam tomorrow. So if you have a bad story to share about your CFA test experience tomorrow, please contact Lisa at ldu@businessinsider.com.